Please click here to obtain permission to reproduce this image.
Click on image to view larger version.
Figure 2 Sample size requirements are displayed when an average from one to six leads are used to measure ST segment depression during exercise. Results are presented for the rate of increase of ST depression (dashed line), ST depression at peak exercise (dotted line), and ST depression at equivalent sub-maximal exercise (solid lines). The influence of using only the longest equivalent sub-maximal exercise (one time point) and of averaging ST depression recorded from earlier 30-s ECGs is displayed for one to six time points.
|
